Mackenzie (I know so many find it overly feminine now, but honestly, I've come across about 6 boy Mackenzies, and only one girl Mackenzie, so it really doesn't seem that awful to me)McKinley (seems to be the most masculine of the Mc- names to me, personally... Sort of seems semi-patriotic, thanks to President McKinley, too...)
Any Max name (Maxwell, Maximilian, Maxon/Macsen, Maxfield, Maddox, etc.)